Literal translation
as long as he's turning, he's making turns
Meaning
as long as he's at it, he does nothing else
Explanation
Said of someone who, as long as they're busy with one thing, does nothing else, or who wastes time endlessly repeating the same pointless actions. It applies, for instance, to someone who spends their time running little errands just to keep busy, or to someone who keeps starting the same task over, or who searches for something while other things wait.